<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ChangePublisher.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.gui;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.dellroad.stuff.vaadin7.VaadinConfigurable;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import org.jsimpledb.JObject;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import org.jsimpledb.JTransaction;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import org.jsimpledb.change.Change;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.jsimpledb.change.SimpleFieldChange;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.jsimpledb.core.ObjId;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.core.Transaction;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.springframework.beans.factory.annotation.Autowired;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.springframework.beans.factory.annotation.Qualifier;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.springframework.context.event.ApplicationEventMulticaster;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.springframework.stereotype.Component;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>/**<a name="line.22"></a>
<span class="sourceLineNo">023</span> * Publishes change notifications.<a name="line.23"></a>
<span class="sourceLineNo">024</span> */<a name="line.24"></a>
<span class="sourceLineNo">025</span>@Component<a name="line.25"></a>
<span class="sourceLineNo">026</span>@VaadinConfigurable<a name="line.26"></a>
<span class="sourceLineNo">027</span>public class ChangePublisher {<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>    @Autowired<a name="line.29"></a>
<span class="sourceLineNo">030</span>    @Qualifier("jsimpledbGuiEventMulticaster")<a name="line.30"></a>
<span class="sourceLineNo">031</span>    private ApplicationEventMulticaster eventMulticaster;<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>    /**<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * Publish the given {@link Change} if the current transaction is successful.<a name="line.34"></a>
<span class="sourceLineNo">035</span>     *<a name="line.35"></a>
<span class="sourceLineNo">036</span>     * @param change change during the current transaction<a name="line.36"></a>
<span class="sourceLineNo">037</span>     */<a name="line.37"></a>
<span class="sourceLineNo">038</span>    public void publishChangeOnCommit(Change&lt;?&gt; change) {<a name="line.38"></a>
<span class="sourceLineNo">039</span>        JTransaction.getCurrent().getTransaction().addCallback(<a name="line.39"></a>
<span class="sourceLineNo">040</span>          new PublishChangeCallback(this.eventMulticaster, new DataChangeEvent(this, change)));<a name="line.40"></a>
<span class="sourceLineNo">041</span>    }<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>    /**<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * Publish that the specified object has changed if the current transaction is successful.<a name="line.44"></a>
<span class="sourceLineNo">045</span>     *<a name="line.45"></a>
<span class="sourceLineNo">046</span>     * @param jobj object changed during the current transaction<a name="line.46"></a>
<span class="sourceLineNo">047</span>     */<a name="line.47"></a>
<span class="sourceLineNo">048</span>    public void publishChangeOnCommit(JObject jobj) {<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>        // We rely here on the fact that publishing a change in any property reloads all properties for that object<a name="line.50"></a>
<span class="sourceLineNo">051</span>        this.publishChangeOnCommit(new SimpleFieldChange&lt;Object, ObjId&gt;(jobj,<a name="line.51"></a>
<span class="sourceLineNo">052</span>          Integer.MAX_VALUE, JObjectContainer.OBJECT_ID_PROPERTY, jobj.getObjId(), jobj.getObjId()));<a name="line.52"></a>
<span class="sourceLineNo">053</span>    }<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span>// PublishChangeCallback - notifies the rest of the application when a data instance has been added/removed/changed<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span>    private static class PublishChangeCallback extends Transaction.CallbackAdapter {<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>        private final ApplicationEventMulticaster eventMulticaster;<a name="line.59"></a>
<span class="sourceLineNo">060</span>        private final DataChangeEvent event;<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span>        PublishChangeCallback(ApplicationEventMulticaster eventMulticaster, DataChangeEvent event) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>            if (eventMulticaster == null)<a name="line.63"></a>
<span class="sourceLineNo">064</span>                throw new IllegalArgumentException("null eventMulticaster");<a name="line.64"></a>
<span class="sourceLineNo">065</span>            if (event == null)<a name="line.65"></a>
<span class="sourceLineNo">066</span>                throw new IllegalArgumentException("null event");<a name="line.66"></a>
<span class="sourceLineNo">067</span>            this.eventMulticaster = eventMulticaster;<a name="line.67"></a>
<span class="sourceLineNo">068</span>            this.event = event;<a name="line.68"></a>
<span class="sourceLineNo">069</span>        }<a name="line.69"></a>
<span class="sourceLineNo">070</span><a name="line.70"></a>
<span class="sourceLineNo">071</span>        @Override<a name="line.71"></a>
<span class="sourceLineNo">072</span>        public void afterCommit() {<a name="line.72"></a>
<span class="sourceLineNo">073</span>            this.eventMulticaster.multicastEvent(this.event);<a name="line.73"></a>
<span class="sourceLineNo">074</span>        }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>        @Override<a name="line.76"></a>
<span class="sourceLineNo">077</span>        public boolean equals(Object obj) {<a name="line.77"></a>
<span class="sourceLineNo">078</span>            if (obj == null || obj.getClass() != this.getClass())<a name="line.78"></a>
<span class="sourceLineNo">079</span>                return false;<a name="line.79"></a>
<span class="sourceLineNo">080</span>            final PublishChangeCallback that = (PublishChangeCallback)obj;<a name="line.80"></a>
<span class="sourceLineNo">081</span>            return this.event.equals(that.event);<a name="line.81"></a>
<span class="sourceLineNo">082</span>        }<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span>        @Override<a name="line.84"></a>
<span class="sourceLineNo">085</span>        public int hashCode() {<a name="line.85"></a>
<span class="sourceLineNo">086</span>            return this.event.hashCode();<a name="line.86"></a>
<span class="sourceLineNo">087</span>        }<a name="line.87"></a>
<span class="sourceLineNo">088</span>    }<a name="line.88"></a>
<span class="sourceLineNo">089</span>}<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>




























































</pre>
</div>
</body>
</html>
